cs428x_write_codec
rv = cs428x_write_codec(addr, reg, data);
cs428x_write_codec(sc, AC97_REG_POWER, data & 0xfeff);
sc->host_if.write = cs428x_write_codec;
cs428x_write_codec(sc, AC97_REG_HEADPHONE_VOLUME, 0);
cs428x_write_codec(sc, AC97_REG_MASTER_VOLUME, 0);
cs428x_write_codec(sc, AC97_REG_POWER, data & 0xfdff);
int cs428x_write_codec(void *, u_int8_t, u_int16_t);